#!/bin/bash

GDAL_TILE_PROCESSES=16
GDAL_TILE_ZOOMS=8-14
GDAL_SAMPLING_WARP=cubic
GDAL_SAMPLING_TILE=antialias

# Create virtual dataset with coordinates
gdal_translate -of VRT -a_srs EPSG:4326 -outsize 300% 300% -gcp 1582.5 3078.211784324625 24 57.5 -gcp 22753.5 2998.8101723179543 24.75 57.5 -gcp 23049.0 29388.081712062252 24.75 57 -gcp 1572.0 29527.952751528625 24 57 mapster/Estland-Lettland_100K_33_SW_Valmiera_(Wolmar)_IV.1941.jpg Estland-Lettland_100K_33_SW_Valmiera_(Wolmar)_IV.1941.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1582.5 3078.211784324625\n22753.5 2998.8101723179543\n23049.0 29388.081712062252\n1572.0 29527.952751528625" | \
  gdaltransform -tps -output_xy Estland-Lettland_100K_33_SW_Valmiera_(Wolmar)_IV.1941.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Estland-Lettland_100K_33_SW_Valmiera_(Wolmar)_IV.1941.vrt Estland-Lettland_100K_33_SW_Valmiera_(Wolmar)_IV.1941.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Estland-Lettland_100K_33_SW_Valmiera_(Wolmar)_IV.1941.cut.vrt Estland-Lettland_100K_33_SW_Valmiera_(Wolmar)_IV.1941.xyz